diff --git a/example/main.go b/example/main.go
index e5f818e..19210ff 100644
--- a/example/main.go
+++ b/example/main.go
@@ -1,3 +1,13 @@
+// Copyright 2016 The go-vgo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// https://github.com/go-vgo/robotgo/blob/master/LICENSE
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 package main
 
 import (
@@ -125,6 +135,12 @@ func main() {
 		fmt.Println("---you press k---", "k")
 	}
 
+	fmt.Println("---please press f1---")
+	feve := robotgo.AddEvent("f1")
+	if feve == 0 {
+		fmt.Println("you press...", "f1")
+	}
+
 	fmt.Println("---please press left mouse button---")
 	mleft := robotgo.AddEvent("mleft")
 	if mleft == 0 {